Cycloheptanedone, also known as cork ketone, is a colorless oily liquid with peppermint odor, cycloheptenone by nitric acid oxidation can be prepared to obtain heptanic acid, catalyzed hydrogenation by nickel at 175 °C or reduced with sodium in boiling ethanol to obtain cycloheptanol, Chemicalbook reacted with bromine in carbon tetrachloride to obtain 2,7-dibromocycloheptanone. The usual preparation method used in laboratories is to distill octanedioic acid with lime or heat it in vacuum from zinc or magnesium salts of octanediic acid at 400°C.